Means for attaching surveyor&#39;s plumb-lines to the roofs, sides, or floors of mine-workings, tunnels, or for similar purposes.



T. PEAGOGK.

MEANS FOR ATTAGHING SURVEYORS PLUMB LI TO THE ROOFS, SIDES, 0R FLOORS QF MINE wommms, TUNNE R SIMILAR PURPOSES. APPLIOATI ILED MAY 28, 1909.

946,579. Patented Jan. 18, 1910.

Witnesses. Inventor.

m, MW

UNITED STATE$ PATENT OFFTQE.

THOMAS PEACOCK, OF JEROME, ARIZONA TERRITORY.

MEANS FOR ATTACI-IING SURVEYORS PLUMB-LINES TO THE ROOFS, SIDES, OR FLOORS OF MINE-WORKINGS, TUNNELS, OR- FOR SIMILAR PURPOSES.

Specification of Letters Patent.

Patented Jan. 18, 1910.

Application filed. May 28, 1909. Serial No. 499,052.

To all whom it may concern:

Be it known that I, THOMAS Pnaooon, a subject of Great Britain, residing at Jerome, in the county of Yavapai and Territory of Arizona, have invented a new and useful Improvement in Means for Attaching Sun veyors Plumb-Lines to the Roofs, Sides, or Floors of h lineorkings or Tunnels or for Similar Purposes.

My invention relates to an article manufactured of plaster, cement, porcelain or other suitable material, carrying a bent and punched metallic strip for the attachment of a plumb or sighting line; and which may be firmly and permanently attached to any surface of rock or similar material by the use of plaster or cement, and the objects of my improvement are, first, to dispense with the labor of drilling a hole in hard rock for the insertion of a wooden plug, which is the method hitherto mostly used; second, to minimize the liability of a survey station mark or alinement point being moved by some unauthorized person. I attain these objects by the manufactured article illustrated on the accompanying drawings in which Figure 1 is a view of the lower face, Fig. 2 is a section of the appliance as attached to a surface of rock, and Fig. is a similar section of a detailed form of construction for use under special conditions.

Similar letters refer to similar throughout the several views.

The body, A, of the appliance may be either wholly cast or molded in plaster, cement, or other suitable material for use in dry places, or it may be formed as a cup B, of glass, porcelain, metal, or other suitable substance, filled with plaster or other suitable material for use in very wet places or where it may be desirable to apply a more permanent form of construction, on account of the deleterious action of water or acids, or wherethe appliance would be liable to receive knocks or other rough usage. A metallic strip, G, suitably bent is partially embedded in the plaster or cement forming the body of the mold. This strip is provided with a hole, D, in its projecting part from which a string or plumb line may be suspended. The strip, C, will project a. very parts small distance from the face of the mold or cup, and present a smooth flat surface rounded at the edges, so as to minimize the liability of becoming distorted from blows of small pieces of rock thrown by blasting operations, or from accidental collision with tools or such like.

The method of using the appliance is as follows: A quantity of suitable cementor plaster is mixed with water or otherwise prepared at the place where the survey station mark or alinement point is required. The flat surface of the mold is coated with the prepared plaster or cement and the mold is then pressed firmly against the rocky surface in the desired position, for a short period until the cement, E, sets suiiiciently to hold the weight of the mold. The mold is then left undisturbed until the cement has become properly set when the appliance is ready for use.

In fixing an alinement point or mark where it is necessary to make most careful observations and measurements it would be desirable to first fix a temporary point immediately under the position of the mark and then to adjust the mold in position by a plumb bob suspended from the hole, D.

I claim:

A molded article hemispherical in shape formed of cement, plaster, porcelain, glass, or other suitable material, a metallic strip bent in the form of a staple, having the ends split, one part of each end turned outward and the other part turned inward, the metallic strip or staple embedded or firmly fixed in the molded article so that the flat end of the strip is even with the surface of the molded article, a cavity being formed under the flat end for the purpose of receiving a knob or fastening on a string inserted through a hole drilled or punched in the fiat end of the metallic strip or staple, the whole in combination to be used for the suspension or attachment of surveyors plumb or sighting lines to the roof, sides, or floor of mine workings, or tunnels, or for similar purposes.

THOMAS PEACOCK.

Witnesses:

ROBERT TALLY,

HENRY M. Wmrz. 

